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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    
    <script>
        // 定义数组
        let arr = [1,2,3,4,5];
        console.log(arr[1]);
        arr.push(9,10,11);
        console.log(arr);

        // 定义 json 对象
        let user = {
            name : "张三",
            age : 12,
            gender : false
        }

        console.log(user);
        console.log(user.name);
        console.log(user.age);
        console.log(user.gender);
    </script>
</body>
</html>